Difference Between Constant and ReadOnly in C# | CSharp Interview Questions & Answers

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See our other Step by Step video series below :-

In this video we will try to understand what is the difference between 2 important keywords in c# Constant and readonly.

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[zerosandones]

Constants:
Constants based on "consts":
- const fields are called compile-time constants
- an absolute constant
- the value of a const variable is set during the declaration itself
- consts variables SHOULD have a value when declared
- the const's value is stored in the IL code itself

Constants based on "readonly":
- the modifier readonly creates fields, which values cannot be changed once they are assigned.
- don't need to define a value during the declaration itself
(a readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which
the field is defined or a variable initializer))
- readonly fields are called run-time constants
- their values cannot be changed after assignment
- this process(value assignment) happens during the execution of the program (in runtime)

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[dnskk]

sir const are implicitly static so u need not to put static in front of them

[faisalraufpitafi]

sir Aslam o alikum I am from Karachi Pakistan I like your teaching way Mashallah Mashallah you are perfect teacher and I will share your videos with my friends because I want they should learn .

[expertreviews]

absolutely fantastic video. goodness me such good explanation. Be Blessed

Very helpful. Thank you. Never really understood the point of readonly until now.

[HikeThePlanets]

Thanks so much for explaining that so simply and thoroughly.

[olglez]

Nice one. Very clearly explained with a good example. This may come up on an interview open day!

[pcmit]

The static modifier is not allowed in a constant declaration.

[mradosovic]

Very nice explanation with a good example.

[MaximusMotivatvation]

Thanks for sharing this informatational video

[aks-tech-]

I have one suggestion here. You can brief the topic and then explain the programming. You are good in all the way. I am your paid user

[saurabhmahal]

Great way to tell the difference ...thanks

[Shakti_Singh_Om]

Important point here is that constants are by default static. You can use static keyword with Readonly and not with constants.

[sery]

Can you explain the logic of static inline with const and readonly, they have contradictins...

[rohitjoshi]

You declare the static Constructor and used the access modifier, which prone to error.

[kavithan]

Instead of read-only we can use integer right..is their any difference in memory allocation

[PanikGrafik]

Dont forget that the value IS STILL HELD !!!

[rjshukla_vlogs]

Hello Sir ji .. Its really nice example but i have 1 question here that we can't have static and const simultaneously ?? it is saying that you cant have static with the const ? Could you please let me know how this happens in your example ?? Thanks you so much for your help :)

[rajarajanseeman]

Still wondering how would you be able to mark as static in const variable? I see the below error

Error 1 The constant 'xxx.Program.myproconst' cannot be marked static